Abū al-Sibṭayn (Arabic: أبوالسبطین) refers to Amir al-Mu'minin Ali (a).
Since the word "sibt" (Arabic: سبط) means grandson, and Imam al-Hasan al-Mujtaba (a) and Imam al-Husayn (a) were the Prophet Muhammad's (s) grandsons, each of them is called "Sibt al-Nabi (s)"—that is, grandson of the Prophet (s). When they both are referred to the word "sibt" is used in a dual form: "sibtayn" (two grandsons). Thus one of Imam Ali's (a) titles is "Abu al-Sibtayn", that is, the father of two grandsons (of the Prophet (s)).
- The material for this article is mainly taken from ابوالسبطین in Farsi WikiShia.